<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert
        title="注意：只允许为第三级分类设置相关参数！"
        type="warning" :closable="false" show-icon>
      </el-alert>

      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            v-model="selectedCateKeys"
            :options="catelist"
            :props="cateProps"
            @change="handleChange"></el-cascader>
          </el-col>
      </el-row>

      <!-- tab 页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleClick">

        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加参数按钮 -->
          <el-button @click="addDialogVisible = true" :disabled="isBtnDisabled" type="primary" size="mini">添加参数</el-button>
          <!-- 动态标签列表 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染Tag标签 -->
                <el-tag v-for="(item, i) in scope.row.attr_vals"
                :key="i" closable @close="handleClose(i, scope.row)">
                  {{item}}
                </el-tag>
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button size="mini" type="primary"
                icon="el-icon-edit" @click="showEditDialog(scope.row)">编辑</el-button>
                <el-button size="mini" type="danger"
                icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>

        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 添加属性的按钮 -->
          <el-button @click="addDialogVisible = true" :disabled="isBtnDisabled" type="primary" size="mini">添加属性</el-button>
          <!-- 静态属性列表 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染Tag标签 -->
                <el-tag v-for="(item, i) in scope.row.attr_vals"
                :key="i" closable @close="handleClose(i, scope.row)">
                  {{item}}
                </el-tag>
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button size="mini" type="primary"
                icon="el-icon-edit" @click="showEditDialog(scope.row)">编辑</el-button>
                <el-button size="mini" type="danger"
                icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%" @close="addDialogClose">
      <el-form ref="addFormRef" :rules="addFormRules" :model="addForm" label-width="80px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%" @close="editDialogClose">
      <el-form ref="editFormRef" :rules="editFormRules" :model="editForm" label-width="80px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>

  </div>
</template>

<script>
export default {
  data () {
    return {
      // 商品分类列表
      catelist: [],
      // 级联选择框的配置对象
      cateProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 级联选择框中被选中的分类id数组
      selectedCateKeys: [],
      // 被激活的页签名称
      activeName: 'many',
      // 获取到的动态参数数据
      manyTableData: [],
      // 获取到的静态参数数据
      onlyTableData: [],
      // 控制添加对话框的显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addForm: {
        attr_name: ''
      },
      // 添加表单的验证规则对象
      addFormRules: {
        attr_name: [{ required: true, message: '请输入参数名称', trigger: 'blur' }]
      },
      // 控制修改对话框的显示与隐藏
      editDialogVisible: false,
      // 修改表单数据对象
      editForm: {
        attr_name: '',
        attr_id: ''
      },
      // 修改表单的验证规则对象
      editFormRules: {
        attr_name: [{ required: true, message: '请输入参数名称', trigger: 'blur' }]
      }
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    // 获取所有的商品分类列表
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) return this.$message.error('获取商品分类失败！')
      this.catelist = res.data
      console.log(this.catelist)
    },
    // 级联选择框选中项变化 会触发这个函数
    handleChange () {
      this.getParamsData()
    },
    // tab 页签点击事件的处理函数
    handleClick () {
      console.log(this.activeName)
      this.getParamsData()
    },
    // 点击编辑按钮
    edit (paramsInfo) {
      console.log(paramsInfo)
    },
    // 获取参数的列表数据
    async getParamsData () {
      // 证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        // 将级联选择框清空
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }

      // 根据所选分类的Id，和当前所处的面板，获取对应的参数
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: this.activeName } })
      if (res.meta.status !== 200) return this.$message.error('获取参数列表失败！')
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        // 文本框中输入的值
        item.inputValue = ''
      })
      console.log(res.data)
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 监听添加对话框的关闭事件
    addDialogClose () {
      this.$refs.addFormRef.resetFields()
    },
    // 点击按钮 添加参数
    addParams () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 201) return this.$message.error('添加参数失败！')
        this.$message.success('添加参数成功！')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    // 点击按钮 展示修改对话框
    showEditDialog (paramsInfo) {
      console.log(paramsInfo)
      this.editForm.attr_name = paramsInfo.attr_name
      this.editForm.attr_id = paramsInfo.attr_id
      this.editDialogVisible = true
    },
    // 重置修改的表单
    editDialogClose () {
      this.$refs.editFormRef.resetFields()
    },
    // 点击按钮 修改参数信息
    editParams () {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 200) {
          return this.$message.error('修改参数信息失败！')
        }
        this.$message.success('修改参数信息成功！')
        this.editDialogVisible = false
        this.getParamsData()
      })
    },
    // 根据Id删除对应的参数
    async removeParams (attrId) {
      const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmResult === 'cancel') return this.$message.info('已取消删除')
      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attrId}`)
      if (res.meta.status !== 200) return this.$message.error('删除失败！')
      this.$message.success('删除成功！')
      this.getParamsData()
    },
    // 文本框失去焦点 或摁下了 Enter 都会触发
    handleInputConfirm (paramsInfo) {
      if (paramsInfo.inputValue.trim().length === 0) {
        paramsInfo.inputValue = ''
        paramsInfo.inputVisible = false
        return
      }
      paramsInfo.attr_vals.push(paramsInfo.inputValue.trim())
      paramsInfo.inputValue = ''
      paramsInfo.inputVisible = false
      // 向服务器发送请求 编辑提交参数
      this.saveAttrVals(paramsInfo)
    },
    // 点击按钮 展示文本输入框
    showInput (paramsInfo) {
      paramsInfo.inputVisible = true
      // 让文本框自动获得焦点
      // $nextTick 方法的作用 当页面上的元素被重新渲染生成之后 才会执行回调函数中的代码 因为必须在元素生成之后才能操作元素
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 发起编辑参数请求
    async saveAttrVals (paramsInfo) {
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${paramsInfo.attr_id}`, {
        attr_name: paramsInfo.attr_name,
        attr_sel: paramsInfo.attr_sel,
        attr_vals: paramsInfo.attr_vals.join(' ')
      })
      if (res.meta.status !== 200) return this.$message.error('编辑提交参数失败！')
      this.$message.success('编辑提交参数成功！')
    },
    // 删除对应的参数可选项
    handleClose (i, paramsInfo) {
      paramsInfo.attr_vals.splice(i, 1)
      // 发送请求
      this.saveAttrVals(paramsInfo)
    }
  },
  computed: {
    isBtnDisabled () {
      if (this.selectedCateKeys.length !== 3) return true
      return false
    },
    // 当前选择的三级分类的id
    cateId () {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    // 动态计算标题的文本
    titleText () {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  }
}
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0
}

.el-tag {
  margin: 10px;
}

.input-new-tag {
  width: 120px;
}
</style>
